Bone conduction hearing device,申请号US19390305277-传众专利搜索

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发明名称	Bone conduction hearing device
摘要
申请公布号	US2239550(A)	申请公布日期	1941.04.22
申请号	US19390305277	申请日期	1939.11.20
申请人	AUREX CORPORATION	发明人	CUBERT JOSEPH R.
分类号	H04R17/00	主分类号	H04R17/00
代理机构		代理人
主权项
地址

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